OREGON
STATE
UNIVERSITY
POTATO UPDATE
Hermiston Agricultural Research and Extension Center
August 7, 2009
st
2121 South 1 Street, P.O. Box 105, Hermiston, Oregon 97838, T 541-567-8321 | F 541-567-2240
Silvia I. Rondon, Extension Entomologist ● Philip B. Hamm, Extension Plant Pathologist
Insect Trap Report Serving Umatilla and Morrow Counties
Traps are collected on Thursdays.
TRAP
PTW
0
0
1
0
2
8
3
3
4
6
5
0
6
5
7
9
8
6
9
1
10
0
11
1
12
10
13
2
14
1
15
1
16
6
17
6
18
4
19
2
20
0
21
0
22
1
23
0
24
2
25
1
26
0
27
4
28
0
29
2
30
0
31
5
32
2
33
Removed
34
0
35
14
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
GPA: Green Peach Aphid
BLH
1
0
110
5
84
50
26
34
6
2
0
3
1
4
5
18
2
10
44
30
0
86
6
18
18
8
18
0
3
4
29
15
58
→
11
35
OA:
PA:
PA
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
→
0
0
Other Aphids
Potato Aphids
GPA
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
→
0
0
OA
0
0
2
2
2
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
→
0
0
FYI
Regarding the potato tuberworm (PTW),
did you know that …..
• There are a number of insecticides that have been
proven effective in controlling this insect. For
current pesticide recommendations check
http://insects.ippc.orst.edu/pnw/insects
• Elimination of cull piles and volunteers help
reducing PTW populations
• PTW prefers foliage versus tubers, thus, PTW
moths and larvae are forced to go into the ground
as vines are killed and, consequently, the risk of
tuber damage increases
• Tubers that are exposed or close to the surface are
at high risk for PTW damage
• Keeping the soil moist via overhead irrigation to
avoid cracks in the soil, particularly later in the
season when vines are beginning to die, reduces
PTW tuber infestation
• The length of time between desiccation and
harvest is crucial: the longer the vines are dead and
left in the field, the greater the likelihood of tuber
infestation.
Agriculture, Family and Community Development, 4-H Youth, Forestry, Energy, and Extension Sea Grant Programs. Oregon State University, United States
Department of Agriculture, and Umatilla County cooperating. The Extension Service offers its programs and materials equally to all people.